content: /*
   * Copyright 2016-present David Karnok
   *
   * Licensed under the Apache License, Version 2.0 (the "License");
   * you may not use this file except in compliance with the License.
   * You may obtain a copy of the License at
   *
   *     http://www.apache.org/licenses/LICENSE-2.0
   *
   * Unless required by applicable law or agreed to in writing, software
   * distributed under the License is distributed on an "AS IS" BASIS,
   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   * See the License for the specific language governing permissions and
   * limitations under the License.
   */
  
  package hu.akarnokd.rxjava3.basetypes;
  
  import java.util.Objects;
  
  import org.reactivestreams.Subscriber;
  
  import hu.akarnokd.rxjava3.basetypes.SoloUsing.UsingSubscriber;
  import io.reactivex.rxjava3.exceptions.*;
  import io.reactivex.rxjava3.functions.*;
  import io.reactivex.rxjava3.internal.subscriptions.EmptySubscription;
  import io.reactivex.rxjava3.plugins.RxJavaPlugins;
  
  /**
   * Use a resource while the actual Perhaps is running.
   * @param <T> the element type of the supplied Perhaps
   * @param <R> the resource type
   */
  final class PerhapsUsing<T, R> extends Perhaps<T> {
  
      final Supplier<R> resourceSupplier;
  
      final Function<? super R, ? extends Perhaps<? extends T>> sourceSupplier;
  
      final Consumer<? super R> disposer;
  
      final boolean eager;
  
      PerhapsUsing(Supplier<R> resourceSupplier,
              Function<? super R, ? extends Perhaps<? extends T>> sourceSupplier,
              Consumer<? super R> disposer, boolean eager) {
          this.resourceSupplier = resourceSupplier;
          this.sourceSupplier = sourceSupplier;
          this.disposer = disposer;
          this.eager = eager;
      }
  
      @Override
      protected void subscribeActual(Subscriber<? super T> s) {
          R resource;
  
          try {
              resource = resourceSupplier.get();
          } catch (Throwable ex) {
              Exceptions.throwIfFatal(ex);
              EmptySubscription.error(ex, s);
              return;
          }
  
          Perhaps<? extends T> np;
  
          try {
              np = Objects.requireNonNull(sourceSupplier.apply(resource), "The sourceSupplier returned a null Nono");
          } catch (Throwable ex) {
              Exceptions.throwIfFatal(ex);
              if (eager) {
                  try {
                      disposer.accept(resource);
                  } catch (Throwable exc) {
                      Exceptions.throwIfFatal(exc);
                      ex = new CompositeException(ex, exc);
                  }
  
                  EmptySubscription.error(ex, s);
              } else {
                  EmptySubscription.error(ex, s);
                  try {
                      disposer.accept(resource);
                  } catch (Throwable exc) {
                      Exceptions.throwIfFatal(exc);
                      RxJavaPlugins.onError(exc);
                  }
              }
              return;
          }
  
          np.subscribe(new UsingSubscriber<T, R>(s, resource, disposer, eager));
      }
  }
  